Electric Traction
For three-phase induction motors which of the following is the least efficient method of speed control?

Rheostat control
Combination of cascade and pole changing
Cascade control
Pole changing

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Electric Traction
Coefficient of adhesion is

Low in case of D.C. traction than in the case of AC. traction
All of the listed here
High in case of D.C. traction than in the case of AC. traction
Equal in both AC. and D.C. traction

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